The noncoding RNA Mistral activates Hoxa6 and Hoxa7 expression and stem cell differentiation by recruiting MLL1 to chromatin.

The noncoding RNA Mistral activates Hoxa6 and Hoxa7 expression and stem cell differentiation by recruiting MLL1 to chromatin.
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DOI:
10.1016/j.molcel.2011.08.019
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发表时间:
2011-09-16
期刊:
影响因子:
16
通讯作者:
Sauer F
Sauer F
中科院分区:
生物学1区
文献类型:
--
作者:
Bertani S;Sauer S;Bolotin E;Sauer F

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表观遗传激活剂混合谱系白血病1(MLL 1)对于胚胎发育和造血至关重要。在这里,我们证明了长的,非编码RNA(lncRNA)米斯特拉尔(米拉)激活小鼠胚胎干细胞(mESC)的同源异型基因Hoxa6和Hoxa7的转录,通过招募Mll 1染色质。Mira基因位于分隔Hoxa6和Hoxa7的间隔DNA区域(SDR)中,在mESC中转录沉默,并被视黄酸激活。Mira介导的Mll 1向Mira基因的募集触发染色体构象的动态变化,最终激活Hoxa6和Hoxa7转录。Hoxa6和Hoxa7在mESC分化过程中以合作和冗余的方式激活参与胚层特化的基因的表达。我们的研究结果连接的lncRNA Mira与招募Mll 1的靶基因和牵连lncRNA在脊椎动物细胞命运决定的基因表达的表观遗传激活。
The epigenetic activator Mixed lineage leukemia 1 (Mll1) is paramount for embryonic development and hematopoiesis. Here we demonstrate that the long, non-coding RNA (lncRNA) Mistral (Mira) activates transcription of the homeotic genes Hoxa6 and Hoxa7 in mouse embryonic stem cells (mESC) by recruiting Mll1 to chromatin. The Mira gene is located in the spacer DNA region (SDR) separating Hoxa6 and Hoxa7, transcriptionally silent in mESCs, and activated by retinoic acid. Mira-mediated recruitment of Mll1 to the Mira gene triggers dynamic changes in chromosome conformation, culminating in activation of Hoxa6 and Hoxa7 transcription. Hoxa6 and Hoxa7 activate the expression of genes involved in germ layer specification during mESC differentiation in a cooperative and redundant fashion. Our results connect the lncRNA Mira with the recruitment of Mll1 to target genes and implicate lncRNAs in epigenetic activation of gene expression during vertebrate cell fate determination.
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